Morphologically diversified sulphide mineralization has been found in No. 301 and 302 coal seams (Westphalian B). The main sulphide is pyrite which forms veinlets cross-cutting the sedimentary fabrics of the coal. encrusts the cellular structures and intergrowths with oxysulphides. https://www.markymarkscott.com/product-category/gold-x-gel-pack/